EP0644384A1 - Verfahren zum Reinigen von Förderbändern für Lebensmittelgefrierung - Google Patents

Verfahren zum Reinigen von Förderbändern für Lebensmittelgefrierung Download PDF

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Publication number
EP0644384A1
EP0644384A1 EP94306299A EP94306299A EP0644384A1 EP 0644384 A1 EP0644384 A1 EP 0644384A1 EP 94306299 A EP94306299 A EP 94306299A EP 94306299 A EP94306299 A EP 94306299A EP 0644384 A1 EP0644384 A1 EP 0644384A1
Authority
EP
European Patent Office
Prior art keywords
freezer
freezing compartment
vaporizer
belt
articles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94306299A
Other languages
English (en)
French (fr)
Other versions
EP0644384B1 (de
Inventor
Ron C. Lee
Mark J. Kirschner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde LLC
Original Assignee
BOC Group Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BOC Group Inc filed Critical BOC Group Inc
Publication of EP0644384A1 publication Critical patent/EP0644384A1/de
Application granted granted Critical
Publication of EP0644384B1 publication Critical patent/EP0644384B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
    • F25D3/11—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air with conveyors carrying articles to be cooled through the cooling space
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/36—Freezing; Subsequent thawing; Cooling
    • A23L3/361—Freezing; Subsequent thawing; Cooling the materials being transported through or in the apparatus, with or without shaping, e.g. in form of powder, granules, or flakes
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/36—Freezing; Subsequent thawing; Cooling
    • A23L3/37—Freezing; Subsequent thawing; Cooling with addition of or treatment with chemicals
    • A23L3/375—Freezing; Subsequent thawing; Cooling with addition of or treatment with chemicals with direct contact between the food and the chemical, e.g. liquid nitrogen, at cryogenic temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G45/00—Lubricating, cleaning, or clearing devices
    • B65G45/10—Cleaning devices
    • B65G45/22—Cleaning devices comprising fluid applying means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/066—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air supply
    • F25D2317/0661—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air supply from the bottom
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/22—Cleaning means for refrigerating devices

Definitions

  • the present invention relates to a freezer in which articles to be refrigerated pass through the freezer on a porous belt. More particularly, the present invention relates to a cryogenic freezer in which the articles are refrigerated by nitrogen vapour being circulated through the belt and within the freezer. Even more particularly, the present invention relates to such a cryogenic freezer in which a bed of the article to be frozen is fluidized on the belt.
  • Industrial freezers incorporate a porous belt on which articles to be refrigerated are conducted through a freezing compartment from an inlet to an outlet of the freezing compartment.
  • Various means are provided to produce refrigeration within the freezing compartment including the use of liquid and gaseous cryogens formed from liquefied carbon dioxide and nitrogen.
  • the refrigeration is typically provided for cryogenic freezers by spraying a liquid cryogen into the freezing compartment through spray nozzles.
  • Cryogenic vapour produced through the introduction of the liquid cryogen into the freezing compartment is circulated to refrigerate the articles.
  • the cryogenic vapour is circulated with a sufficient velocity to fluidize a bed of articles to be frozen, passing through the freezer on the porous belt.
  • Prior art methods for cleaning ice from the belt have included wire brushes to scrape off the ice and routing the belt outside of the freezer where a forced flow of ambient air is used to defrost the belt. These methods suffer from being either unreliable, overly complex, and/or thermally inefficient.
  • Another method of belt cleaning in cryogenic freezers has been the introduction of externally vaporized cryogen into the freezer in the form of gas jets directed toward the belt. This method, however, is wasteful of the cryogen because the energy added to vaporize the cryogen represents wasted cooling potential.
  • the present invention provides a cryogenic freezer of less complexity than the prior art and which conserves the cooling potential of the cryogen being used to freeze the articles.
  • the present invention provides a freezer comprising a freezing compartment having an inlet through which articles to be refrigerated enter the freezing compartment and an outlet through which the articles are discharged from the freezing compartment after having been refrigerated.
  • a porous conveyor belt is provided for conveying the articles through the freezing compartment, from the inlet to the outlet.
  • the porous conveyor belt accumulates ice during operation of the freezer.
  • a liquid cryogen conduit means is configured to be connected to a source of liquid cryogen for conveying a stream of the liquid cryogen into the freezing chamber.
  • a vaporizer is located within the freezing chamber and in communication with the liquid cryogen conduit means for vaporizing the stream of the liquid cryogen to form cryogenic vapour.
  • the warmed cryogenic vapour at temperature up to the freezer operating temperature (typically -60°C) has significantly greater energy potential for belt cleaning than the liquid cryogen.
  • a means is provided for directing jets of the cryogenic vapour against the porous belt to clear the ice accumulated on the porous belt.
  • cryogen means any highly volatile fluid that by and large exists as a vapour at atmospheric temperatures and pressures, preferably though, atmospheric gases such as nitrogen.
  • cryogenic freezer constructed in accordance with the present invention does not have the complexity of cryogenic freezers of the prior art that employ external defrosting of freezer belts.
  • Fluidized bed freezer 10 consists of a freezing compartment 12 having an inlet 14 and an outlet 16. Articles 18 to be refrigerated enter inlet 14 of freezing compartment 12 and are discharged from outlet 16 of freezing compartment 12. It should be noted that the present invention can be applied to other cryogenic freezers in which a liquid cryogen is sprayed into a freezing compartment as well as mechanical freezers which do not depend on a cryogen to supply refrigeration.
  • a porous conveyor belt 20 carries articles 18 through freezing compartment 12 from inlet 14 to outlet 16 thereof.
  • circulation fans 22 and 24 Positioned below porous conveyor belt 20, are circulation fans 22 and 24 of well known design to circulate the atmosphere within freezing compartment 12 and to fluidize the bed of articles 18.
  • a liquid nitrogen conduit 26 supplies liquid nitrogen from storage tank 28 to freezing compartment 12 through a primary branch 30 of conduit 26.
  • the liquid nitrogen vaporizes and the evolved nitrogen vapour is circulated within freezing compartment 12 by fans 22 and 24.
  • a subsidiary branch line 32 is provided to conduct a subsidiary stream through a vaporizer 34 which can be a finned vaporizer tube. The length and size of the tube are determined in a known manner based upon the flow rate of nitrogen to be fully vaporized.
  • the liquid nitrogen will vaporize within vaporizer 34, and warmed to nearly the freezing compartment temperature.
  • the illustrated embodiment uses nitrogen, it is possible to utilize the present invention with freezers utilizing other cryogens, provided of course there exists a sufficient temperature differential between the interior of the freezing chamber of such freezers and the cryogen in its liquid state.
  • vaporizer 34 Attached to vaporizer 34 is a header 36 having a width of approximately the same as conveyor belt 20. Header 36 is provided with known blow-off nozzles 38 to direct jets of nitrogen vapour against the belt. These jets are of a sufficient velocity to blow any accumulated ice off the belts. As can be appreciated, the number of blow-off nozzles will vary in dependence on the width of the belt. Additionally, vaporizer 34 being located within freezing compartment 12 and in the circulation path of the atmosphere of freezing compartment 12, will provide surfaces on which moisture preferentially freezes to help prevent accumulation of ice on the belt in the first instance.
  • valves 40 and 42 are provided in order to control cryogenic freezer 10. Suitable adjustment of valves 40 and 42 control the total amount of refrigeration provided versus the amount of nitrogen being used to blow off belt 20. Valve 40 is operated in response to the temperature within the freezer, while valve 42 is normally fully open during the operation of the freezer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
EP94306299A 1993-09-17 1994-08-26 Verfahren zum Reinigen von Förderbändern für Lebensmittelgefrierung Expired - Lifetime EP0644384B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/122,676 US5349828A (en) 1993-09-17 1993-09-17 Conveyor belt cleaning apparatus for food freezing
US122676 1993-09-17

Publications (2)

Publication Number Publication Date
EP0644384A1 true EP0644384A1 (de) 1995-03-22
EP0644384B1 EP0644384B1 (de) 1997-02-12

Family

ID=22404093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94306299A Expired - Lifetime EP0644384B1 (de) 1993-09-17 1994-08-26 Verfahren zum Reinigen von Förderbändern für Lebensmittelgefrierung

Country Status (6)

Country Link
US (1) US5349828A (de)
EP (1) EP0644384B1 (de)
AU (1) AU685823B2 (de)
CA (1) CA2129674C (de)
DE (1) DE69401730T2 (de)
ZA (1) ZA946013B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106005988A (zh) * 2016-06-19 2016-10-12 徐秀 一种具有送料机构的冷却塔

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9102864L (sv) * 1991-10-03 1992-10-19 Frigoscandia Food Process Syst Frysanordning foer livsmedel med transportband som periodvis drivs i motsatt riktning till genommatningsriktningen foer livsmedlet
CA2216101C (en) * 1995-03-28 2010-04-13 The Boc Group, Inc. Apparatus and method for freezing food products
US5802857A (en) * 1997-06-23 1998-09-08 Johns Manville International, Inc. Method of and apparatus for cleaning collection chain conveyors
DE19919935A1 (de) * 1999-04-30 2000-11-02 Linde Tech Gase Gmbh Verfahren zum Auftauen und Trocknen von Kälteanlagen
JP2005535864A (ja) * 2002-08-16 2005-11-24 ザ・ビーオーシー・グループ・インコーポレーテッド 食品の表面外皮を凍結するための方法及び装置
WO2004018945A2 (en) * 2002-08-20 2004-03-04 The Boc Group, Inc. Flow enhanced tunnel freezer
US20160265835A1 (en) * 2015-03-09 2016-09-15 John Brothers Cryogenic freezer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115756A (en) * 1961-11-13 1963-12-31 Lewis Refrigeration Co Method and apparatus for freezing foods
DE2063184A1 (de) * 1969-12-24 1971-07-01 Biuro Projektow Przemysllu Fermen tacyjnego, Warschau Band Wirbe\bett GefnerUmne\ ram Einfrieren von Obst und Gemüse
US4075869A (en) * 1975-02-10 1978-02-28 Boc International Limited Cooling or freezing articles

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3403530A (en) * 1966-10-18 1968-10-01 Colonial Sugar Refining Co Liquid carbon dioxide refrigeration
US3477242A (en) * 1967-06-15 1969-11-11 Lamb Weston Inc Fluid bed apparatus for treating food products
US3982404A (en) * 1974-11-04 1976-09-28 Lewis Refrigeration Co. Individual quick-freezing of moist articles using deep fluidized bed and input conditioner
US4186566A (en) * 1978-04-24 1980-02-05 Lewis Refrigeration Co. Modified wire mesh conveyor belt for air fluidization type food freezers
PL209192A1 (de) * 1978-08-22 1980-03-24 Os Bad Rozwojowy Przem Budowy
US4243136A (en) * 1979-03-12 1981-01-06 Kaufman Michael J Icing prevention system for a conveyor belt
US4399660A (en) * 1981-02-10 1983-08-23 Union Carbide Corporation Atmospheric vaporizer
US4350027A (en) * 1981-10-05 1982-09-21 Lewis Tyree Jr Cryogenic refrigeration apparatus
US4481782A (en) * 1983-01-25 1984-11-13 The Boc Group, Inc. Methods and apparatus for refrigerating products
JPS60152601U (ja) * 1984-03-15 1985-10-11 株式会社　ほくさん 連続式肝臓片凍結装置
US5025632A (en) * 1989-06-13 1991-06-25 General Atomics Method and apparatus for cryogenic removal of solid materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115756A (en) * 1961-11-13 1963-12-31 Lewis Refrigeration Co Method and apparatus for freezing foods
DE2063184A1 (de) * 1969-12-24 1971-07-01 Biuro Projektow Przemysllu Fermen tacyjnego, Warschau Band Wirbe\bett GefnerUmne\ ram Einfrieren von Obst und Gemüse
US4075869A (en) * 1975-02-10 1978-02-28 Boc International Limited Cooling or freezing articles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106005988A (zh) * 2016-06-19 2016-10-12 徐秀 一种具有送料机构的冷却塔

Also Published As

Publication number Publication date
CA2129674A1 (en) 1995-03-18
ZA946013B (en) 1995-05-16
DE69401730D1 (de) 1997-03-27
AU7299294A (en) 1995-03-30
DE69401730T2 (de) 1997-06-19
CA2129674C (en) 1998-06-09
AU685823B2 (en) 1998-01-29
US5349828A (en) 1994-09-27
EP0644384B1 (de) 1997-02-12

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